pa8mm.net - networking

arista_eos

Anonymous (anonymous@undisclosed.example.com) — 2026-04-10T08:25:30+00:00

EOS CHECKSUM # verify /sha512 flash:SMART-eMMC-fw-0x20-v1_0_0.swix CONFIG SESSIONS # commit # abort // discard all the changes and exit config session #show session-config diffs // diff #show session-config named NAME_1 // shows session config

arista_lag

Anonymous (anonymous@undisclosed.example.com) — 2026-01-13T11:56:06+00:00

LAG LAG There are two ways of configuring LAG: * Static configuration * Using LACP protocol * Verifies port settings between devices (speed, duplex, switchport...) LACP configuration: interface Ethernet42 channel-group 10 mode active # can be "active" or "passive"

arista_ports

Anonymous (anonymous@undisclosed.example.com) — 2026-03-02T14:58:31+00:00

ETHERNET PORTS Err-disabled Check the reason: show interfaces status errdisabled Link tracking group A link-state group consists of “downstream” interfaces (connections to servers) and “upstream” interfaces (connections to switches and clients). In the event of a failure of all upstream interfaces in the link-state group, the downstream interfaces are shut down.

arista_routing

Anonymous (anonymous@undisclosed.example.com) — 2026-04-03T10:11:34+00:00

ARISTA ROUTING ROUTE MAPS If route map is applied to the peer, but doesn't exist - it will be just treated as permit any any

arista_tac

Anonymous (anonymous@undisclosed.example.com) — 2026-02-18T12:16:23+00:00

TAC INTERFACE PROBLEMS #show agent logs #show agent qtrace #show interfaces transceiver detail #show interfaces mac detail #show interfaces phy detail Scripted version: #!/bin/bash LOGNAME=logGrab-$HOSTNAME-$(date +%Y-%m-%d.%H%M%S) mkdir /mnt/flash/$LOGNAME cd /mnt/flash/$LOGNAME FastCli -p15 -c "show tech" > ./show-tech sudo cp /var/log/messages . FastCli -p15 -c "show agent logs" > ./show-agent-logs FastCli -p15 -c "show agent qt" > ./show-agent-qt FastCli -p15 -c "show interfaces trans…

arista_traffic_mgmt

Anonymous (anonymous@undisclosed.example.com) — 2026-03-27T20:30:11+00:00

Traffic Management ACL In the end of every ACL there is an implicit deny any! There are three ACL types: * Standard - filter based on source IP * IP ACL - filter based on src/dst IP, port, protocol * MAC ACL - filter based on src/dst MAC address. Can be applied only to

arista_ztp

Anonymous (anonymous@undisclosed.example.com) — 2026-04-08T09:34:42+00:00

ARISTA ZTP Canceling ZTP: localhost(config)#zerotouch cancel Disabling ZTP: localhost#zerotouch disable Enabling ZTP: * Delete the startup-config * Edit /mnt/flash/zerotouch-config (put DISABLE=False there) rm startup-config echo "DISABLE=False" > zerotouch-config

clos

Anonymous (anonymous@undisclosed.example.com) — 2026-04-07T13:26:08+00:00

Data Center Fabrics Stage count - is number of devices I need to pass through in order to get from source to the destination. Clos fabric is a non-planar graph - there is no way to draw all those connections on a flat plane without crossings. 5-stage fabrics type:

containerlab

Anonymous (anonymous@undisclosed.example.com) — 2025-12-03T13:53:17+00:00

ContainerLAB SETUP On the Linux machine, download the Docker image and then import it. Some useful Docker commands: docker import cEOS-lab-4.34.3.1M.tar.xz ceos:4.34.3.1M docker images # should be visible here docker ps # show all running containers docker ps -a # show all containers, including stopped ones. Docker keeps its filesystem, metadata and # reference to the image until you explicitly remove it docker rm # removes the container docker rmi

ftth

Anonymous (anonymous@undisclosed.example.com) — 2026-06-11T12:56:58+00:00

FTTH AON vs PON There are two competing methods for providing a fiber to the home - Active Optical Networks (AON) and Passive Optical Networks (PON). AON is essentially a switched Ethernet. PON Each home has an Optical Network Terminator (ONT) unit which is connected via fiber to the neighbourhood splitter. The splitter combines a number of homes (typically less than 100) onto a single shared optical fiber which connects to the Optical Line Terminator (

isis

Anonymous (anonymous@undisclosed.example.com) — 2025-09-17T14:07:03+00:00

IS-IS Each is-is router is uniquely identified with a NET ISO address. Example format: * 49.0001.0102.5210.8024.00 * 49 - AFI * 0001 - Area * 0102.5210.8024 - System ID * 00 - NSEL - network selector. 00 for IP

juniper_junos

Anonymous (anonymous@undisclosed.example.com) — 2026-02-18T12:10:05+00:00

JUNOS PORT MIRRORING EX With this configuration, VLAN tagging is preserved. set interfaces xe-0/0/19 description "SPAN-SOURCE" set interfaces xe-0/0/19 unit 0 family ethernet-switching interface-mode trunk set interfaces xe-0/0/19 unit 0 family ethernet-switching vlan members PROD set interfaces xe-0/0/19 unit 0 family ethernet-switching vlan members DEV set interfaces xe-0/1/2:3 description "SPAN-OUTPUT" set interfaces xe-0/1/2:3 unit 0 family ethernet-switching set forwarding-options ana…

opengear

Anonymous (anonymous@undisclosed.example.com) — 2026-03-20T11:31:25+00:00

Console Server show port port56 edit port port56 pinout X2 edit port port56 baudrate 9600 apply all

stp

Anonymous (anonymous@undisclosed.example.com) — 2025-12-03T16:11:46+00:00

STP Algorithm How it works: * Each switch generates an ID for itself (PBDU ID) * BPDU ID has two parts - priority:System-Mac * Each switch sends BPDUs out of all its ports (as multicast) * After BPDUs are exchanged, Root switch is elected